/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.http.websocketx;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.FullHttpResponse;

class WebSocketClientProtocolHandshakeHandler
        extends ChannelInboundHandlerAdapter
{
    private final WebSocketClientHandshaker handshaker;

    WebSocketClientProtocolHandshakeHandler(
            WebSocketClientHandshaker handshaker)
    {
        this.handshaker = handshaker;
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception
    {
        super.channelActive(ctx);
        handshaker.handshake(ctx.channel())
                .addListener(new ChannelFutureListener()
                {
                    @Override
                    public void operationComplete(ChannelFuture future)
                            throws Exception
                    {
                        if (!future.isSuccess())
                        {
                            ctx.fireExceptionCaught(future.cause());
                        }
                        else
                        {
                            ctx.fireUserEventTriggered(
                                    WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_ISSUED);
                        }
                    }
                });
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg)
            throws Exception
    {
        if (!(msg instanceof FullHttpResponse))
        {
            ctx.fireChannelRead(msg);
            return;
        }

        FullHttpResponse response = (FullHttpResponse) msg;
        try
        {
            if (!handshaker.isHandshakeComplete())
            {
                handshaker.finishHandshake(ctx.channel(), response);
                ctx.fireUserEventTriggered(
                        WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE);
                ctx.pipeline().remove(this);
                return;
            }
            throw new IllegalStateException(
                    "WebSocketClientHandshaker should have been non finished yet");
        }
        finally
        {
            response.release();
        }
    }
}
